US20020137812A1 - Premixed calcium phosphate cement pastes - Google Patents

Premixed calcium phosphate cement pastes Download PDF

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US20020137812A1
US20020137812A1 US10/057,554 US5755402A US2002137812A1 US 20020137812 A1 US20020137812 A1 US 20020137812A1 US 5755402 A US5755402 A US 5755402A US 2002137812 A1 US2002137812 A1 US 2002137812A1
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paste
glycerol
composition
phosphate
liquid
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US10/057,554
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US6793725B2 (en
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Laurence Chow
Shozo Takagi
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American Dental Association Health Foundation
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American Dental Association Health Foundation
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Priority to US10/057,554 priority Critical patent/US6793725B2/en
Priority to AU2002251814A priority patent/AU2002251814A1/en
Priority to PCT/US2002/001991 priority patent/WO2002062721A1/en
Publication of US20020137812A1 publication Critical patent/US20020137812A1/en
Assigned to AMERICAN DENTAL ASSOCIATION HEALTH FOUNDATION reassignment AMERICAN DENTAL ASSOCIATION HEALTH FOUNDATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHOW, LAURENCE C., TAKAGI, SHOZO
Priority to US10/552,337 priority patent/US7709029B2/en
Priority to PCT/US2004/007422 priority patent/WO2004093734A2/en
Assigned to ADA FOUNDATION reassignment ADA FOUNDATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AMERICAN DENTAL HEALTH ASSCIATION FOUNDATION
Priority to US10/941,443 priority patent/US7294187B2/en
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Publication of US6793725B2 publication Critical patent/US6793725B2/en
Priority to US12/772,843 priority patent/US8282396B2/en
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L24/00—Surgical adhesives or cements; Adhesives for colostomy devices
    • A61L24/02—Surgical adhesives or cements; Adhesives for colostomy devices containing inorganic materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/50—Preparations specially adapted for dental root treatment
    • A61K6/54—Filling; Sealing
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/831—Preparations for artificial teeth, for filling teeth or for capping teeth comprising non-metallic elements or compounds thereof, e.g. carbon
    • A61K6/838—Phosphorus compounds, e.g. apatite
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/849—Preparations for artificial teeth, for filling teeth or for capping teeth comprising inorganic cements
    • A61K6/864—Phosphate cements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/849—Preparations for artificial teeth, for filling teeth or for capping teeth comprising inorganic cements
    • A61K6/873—Carbonates
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/884—Preparations for artificial teeth, for filling teeth or for capping teeth comprising natural or synthetic resins
    • A61K6/898—Polysaccharides
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/02—Inorganic materials
    • A61L27/12—Phosphorus-containing materials, e.g. apatite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
    • C04B28/344—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00836—Uses not provided for elsewhere in C04B2111/00 for medical or dental applications

Definitions

  • a self-hardening calcium phosphate cement consisting of tetra calcium phosphate (TTCP) and anhydrous dicalcium phosphate has been shown in clinical studies to be efficacious as a bone repair material.
  • the hardening time (HT) of the cement is about 30 min when the powder constituents are mixed with water and 5 min when mixed with a phosphate solution as the liquid.
  • Hydroxyapatite (HA) is the major product formed as a result of the mixing and hardening.
  • CPC calcium phosphate cements
  • TCP tricalcium phosphate
  • DCPA dicalcium phosphate
  • OH OH
  • a cement paste of the type referenced mixed with glycerol was studied for root canal filling, sealing, and injectability and it was reported that the glycerol-calcium phosphate cement (CPC) paste showed better biocompatibility than a number of presently used root canal filling or sealing materials.
  • CPC glycerol-calcium phosphate cement
  • the present invention comprises compositions and means for formulating premixed glycerol and calcium phosphate cement pastes that are stable in a package, resist washout, and will harden only after being delivered to the defect or implant site.
  • Glycerol was used as the liquid because the CPC hardening reaction to form HA does not occur in a water-free environment.
  • Hydroxypropyl methylcellulose (HMC) and Na 2 HPO 4 were also added to improve the paste cohesiveness and accelerate cement hardening upon delivery to a desired repair site.
  • TTCP was prepared by heating an equimolar mixture of commercially obtained DCPA and CaCO 3 at 1500° C. for six hours in a furnace and then quenched in air or inert gas to room temperature. Also, TCP was prepared by heating a mixture that contained 2 mol of DCPA and 1 mol of CaCO 3 to 1200° C. for six hours followed by quenching to room temperature.
  • the powders used were ground individually in a planetary ball mill in cyclohexane, ethanol, or dry to obtain the desired median particle size which is about 15 microns and as disclosed in the prior art for making CPC powders.
  • PLS physiologic-like solution
  • a Universal Testing Machine (United Calibration Corp, Garden Grove, Calif., USA) measured DTD values at a loading rate of 10 mm/min.
  • the Gilmore needle method measured HT.
  • Powder X-ray diffraction analysis (XRD) determined the extent of CPC conversion to HA.
  • the premixed CPC pastes would generally have a longer hardening time and lower physical strength, but the results suggest that cement pastes with excellent washout resistance can be prepared by incorporating HMC and Na 2 HPO 4 in glycerol.
  • Phosphate generally decreased HT and DTS for CPC-1, and increased DTS for CPC-II and -III.
  • HMC appeared to decrease HA formation for CPC-I, but had no effect for CPC-II and -III, and did not affect DTS.
  • formation of a bone replacement or dental replacement paste results by combining dry powder constituents, characterized by their conversion to HA in the presence of water or phosphate solutions, with glycerol and hydroxypropyl methyl cellulose and/or Na 2 HPO 4 .
  • the ratio of combined constituents is broad and the resulting paste can be formulated to control rather precisely, the hardening times.
  • Glycerol compounds, analogs and substitutes as well as cellulose analogs and substitutes are within the scope of the invention.

Abstract

A bone or dental implant material in the form of a paste includes a mixture of calcium phosphate powders, that are capable of forming hydroxyapatite, with liquid glycerol and hydroxypropyl methylcellulose and Na2HPO4. The paste will harden upon exposure to water with the time to harden controlled by the choice and ratio of constituents.

Description

    CROSS REFERENCE TO RELATED APPLICATION
  • This is a utility application based upon provisional application Serial No. 60/263,894 filed Jan. 24, 2001 entitled “Premixed Calcium Phosphate Cement Pastes” for which priority is claimed. [0001]
    • BACKGROUND OF THE INVENTION
  • This development was supported in part by USPHS Research Grant DE11789 to the American Dental Association Health Foundation from the NIDCR. The United States or an agency hereof may therefor have certain rights to the claimed invention. [0002]
  • A self-hardening calcium phosphate cement, consisting of tetra calcium phosphate (TTCP) and anhydrous dicalcium phosphate has been shown in clinical studies to be efficacious as a bone repair material. The hardening time (HT) of the cement is about 30 min when the powder constituents are mixed with water and 5 min when mixed with a phosphate solution as the liquid. Hydroxyapatite (HA) is the major product formed as a result of the mixing and hardening. In recent years, additional calcium phosphate cements (CPC) that do not contain TTCP have been developed, e.g.α-tricalcium phosphate (TCP) and C[0003] aCO3; dicalcium phosphate (DCPA) and Ca(OH)2). These cements harden in 10 min when mixed with a phosphate solution, and they also form HA as the final product.
  • A cement paste of the type referenced mixed with glycerol was studied for root canal filling, sealing, and injectability and it was reported that the glycerol-calcium phosphate cement (CPC) paste showed better biocompatibility than a number of presently used root canal filling or sealing materials. However, the prior art did not teach a paste material useful as a bone cement that remains stable over a period of time and hardens only when delivered to a desired site. [0004]
    • SUMMARY OF THE INVENTION
  • The present invention comprises compositions and means for formulating premixed glycerol and calcium phosphate cement pastes that are stable in a package, resist washout, and will harden only after being delivered to the defect or implant site. Glycerol was used as the liquid because the CPC hardening reaction to form HA does not occur in a water-free environment. Hydroxypropyl methylcellulose (HMC) and Na[0005] 2HPO4 were also added to improve the paste cohesiveness and accelerate cement hardening upon delivery to a desired repair site.
    •  DESCRIPTION OF THE PREFERRED EMBODIMENT
  • TTCP was prepared by heating an equimolar mixture of commercially obtained DCPA and CaCO[0006] 3 at 1500° C. for six hours in a furnace and then quenched in air or inert gas to room temperature. Also, TCP was prepared by heating a mixture that contained 2 mol of DCPA and 1 mol of CaCO3 to 1200° C. for six hours followed by quenching to room temperature. The powders used were ground individually in a planetary ball mill in cyclohexane, ethanol, or dry to obtain the desired median particle size which is about 15 microns and as disclosed in the prior art for making CPC powders.
  • Nine liquids containing glycerol and various amounts of HMC (in powder form) and Na[0007] 2HPO4 (in powder form) were then prepared. Their compositions, expressed as mass fractions (%) of HMC and Na2HPO4, are shown in Table 1. The CPC-I, -II and -III were an equimolar mixture of (1) TTCP and DCPA; (2) α-TCP and CaCO3, and (3) DCPA and Ca(OH)2, respectively. CPC pastes were prepared by mixing the prepared CPC powder with the liquid glycerol mixture at powder-to-liquid ratios of 3.5 to 1 to 1.8 to 2.2 and 1.5 to 1.8, respectively. Diametral tensile strength (DTS) samples were prepared by placing the paste into molds (6 mm diameter×3 mm height) with ≈2 MPa of pressure applied. The DTS samples were kept in a mold covered with two fritted glass slides and immersed in a physiologic-like solution (PLS) [1.15 mM Ca, 1.2 mM P, 133 mM NaCl, 50 HEPES, pH=7.4] at 37° C. Glycerol-PLS exchange occurred through the fritted glass allowing the CPC to harden. Samples were removed at 4 hours, then immersed in PLS for an additional 20 h. A Universal Testing Machine (United Calibration Corp, Garden Grove, Calif., USA) measured DTD values at a loading rate of 10 mm/min. The Gilmore needle method measured HT. Powder X-ray diffraction analysis (XRD) determined the extent of CPC conversion to HA.
  • All pastes had excellent washout resistance, they remained stable and hardened while immersed in PLS. The HT and the DTS of 24 hour samples are shown in Table 1. The Newman-Kuels multiple comparison test indicated that the Na[0008] 2HPO4 amount, not the HMC amount, significantly (P<0.05) affected the DTS and HT. Within each group of HMC amount for CPC-I, the lowest phosphate amount substantially increased the DTS while the highest phosphate amount dramatically reduced the HT. For samples CPC-II and -III, the highest phosphate amount significantly increased the DTS and decreased the HT. X-ray diffraction showed only partial conversion of CPC-I to HA and complete conversions of CPC-II and -III to HA in the 24 hour samples.
  • Table 1. Na2NPO4 and HMC compositions expressed as mass fraction (%) in glycerol, 24 h DTS and HT. [0009]
    Liquid Na2NPO4 HMC DTS (MPa) HT (Min)
    CPC-I
    L1 7.5 0.55 4.1 (0.4)  111 (6)
    L2 15 0.55 2.8 (0.2)  93 (3)
    L3 30 0.55 2.1 (0.2)  62 (2)
    L4 7.5 1.1 4.2 (0.2)  97 (8)
    L5 15 1.1 2.6 (0.1)  92 (3)
    L6 30 1.1 2.6 (0.3)  63 (3)
    L7 7.5 2.2 3.6 (0.6)  97 (6)
    L8 15 2.2 3.2 (0.3)  93 (3)
    L9 30 2.2 2.3 (0.3)  62 (3)
    CPC-II
    L1 7.5 0.55 2.0 (0.4)  117 (3)
    L2 15 0.55 2.5 (0.2)  107 (3)
    L3 30 0.55 3.4 (0.4)  80 (5)
    CPC-III
    L1 7.5 0.55 0* >420
    L2 15 0.55 1.0 (0.2)  170 (5)
    L3 30 0.55 1.5 (0.1)  125 (5)
  • The premixed CPC pastes would generally have a longer hardening time and lower physical strength, but the results suggest that cement pastes with excellent washout resistance can be prepared by incorporating HMC and Na[0010] 2HPO4 in glycerol. Phosphate generally decreased HT and DTS for CPC-1, and increased DTS for CPC-II and -III. HMC appeared to decrease HA formation for CPC-I, but had no effect for CPC-II and -III, and did not affect DTS.
  • In sum, formation of a bone replacement or dental replacement paste results by combining dry powder constituents, characterized by their conversion to HA in the presence of water or phosphate solutions, with glycerol and hydroxypropyl methyl cellulose and/or Na[0011] 2HPO4. The ratio of combined constituents is broad and the resulting paste can be formulated to control rather precisely, the hardening times. Glycerol compounds, analogs and substitutes as well as cellulose analogs and substitutes are within the scope of the invention.

Claims (11)

What is claimed is
1. A composition of matter for dental restoration and bone implants and restoration comprising, in combination:
a mixture of glycerol, glycerol analogs or glycerol substitutes and a calcium phosphate compound selected from the group consisting of tetracalcium phosphate; anhydrous dicalcium phosphate; α-tricalcium phosphate with calcium carbonate; dicalcium phosphate with calcium hydroxide and mixtures thereof.
2. The composition of claim 1 including a cellulose compound.
3. The composition of claim 1 including hydroxypropyl methylcellulose.
4. The composition of claim 1 including Na2HPO2.
5. The composition of claim 1 including on accelerator.
6. The composition of claim 6 in the form of a paste.
7. The composition of claim 1 comprising a paste comprised of a liquid including glycerol, hydroxypropyl methlycellulose and Na2NPO4 and powders derived from dicalcium phosphate and calcium carbonate.
8. A paste for bone and tooth restoration comprising, in combination:
a mixture of liquid glycerol and powder derived from dicalcium phosphate and calcium carbonate.
9. The paste of claim 8 wherein the liquid further includes hydroxy methylcellulose.
10. The paste of claim 8 wherein the liquid further includes Na2NPO4.
11. The paste of claim 8 wherein the mass ratio of powder to liquid is in the range of 3.5 to 1 to 1.5 to 1.8.
US10/057,554 2001-01-24 2002-01-23 Premixed calcium phosphate cement pastes Expired - Lifetime US6793725B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US10/057,554 US6793725B2 (en) 2001-01-24 2002-01-23 Premixed calcium phosphate cement pastes
PCT/US2002/001991 WO2002062721A1 (en) 2001-01-24 2002-01-24 Premixed calcium phosphate cement pastes
AU2002251814A AU2002251814A1 (en) 2001-01-24 2002-01-24 Premixed calcium phosphate cement pastes
US10/552,337 US7709029B2 (en) 2001-01-24 2004-03-11 Calcium-containing restoration materials
PCT/US2004/007422 WO2004093734A2 (en) 2002-01-23 2004-03-11 Premixed self-hardening bone graft pastes
US10/941,443 US7294187B2 (en) 2001-01-24 2004-09-15 Rapid-hardening calcium phosphate cement compositions
US12/772,843 US8282396B2 (en) 2001-01-24 2010-05-03 Calcium-containing restoration materials

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US26389401P 2001-01-24 2001-01-24
US10/057,554 US6793725B2 (en) 2001-01-24 2002-01-23 Premixed calcium phosphate cement pastes

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US10/552,337 Continuation-In-Part US7709029B2 (en) 2001-01-24 2004-03-11 Calcium-containing restoration materials
US10/941,443 Continuation-In-Part US7294187B2 (en) 2001-01-24 2004-09-15 Rapid-hardening calcium phosphate cement compositions
US11/552,337 Continuation-In-Part US20080141503A1 (en) 2006-10-24 2006-10-24 Safety clip for a vehicle emergency brake system

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US20020137812A1 true US20020137812A1 (en) 2002-09-26
US6793725B2 US6793725B2 (en) 2004-09-21

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